/* ============================================================
   Half Birthday Calculator - stylesheet
   Original design system. Vanilla CSS, no framework.
   ============================================================ */

:root{
  --ink-900:#161320;
  --ink-700:#3a3550;
  --ink-500:#6b6483;
  --ink-300:#a8a2bd;
  --ink-100:#efedf7;
  --paper:#fffdf9;
  --paper-2:#f8f5ff;
  --coral:#ff6f5e;
  --coral-dark:#e6543f;
  --teal:#1fa792;
  --teal-dark:#178879;
  --gold:#ffb84d;
  --violet:#8b6cf2;
  --violet-dark:#6f4fe0;
  --border:#e7e2f5;
  --radius-lg:22px;
  --radius-md:14px;
  --radius-sm:9px;
  --shadow-soft:0 10px 30px rgba(60,40,90,0.08);
  --shadow-pop:0 18px 40px rgba(60,40,90,0.14);
  --font-display:'Fraunces', Georgia, 'Times New Roman', serif;
  --font-body:'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

@font-face{
  font-family:'Fraunces'; src:local('Georgia'); font-weight: 400 700;
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *,*::before,*::after{ animation-duration:0.01ms !important; animation-iteration-count:1 !important; transition-duration:0.01ms !important; scroll-behavior:auto !important; }
}
body{
  margin:0;
  font-family:var(--font-body);
  color:var(--ink-900);
  background:var(--paper);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{ max-width:100%; display:block; }
a{ color:var(--violet-dark); text-decoration:none; }
a:hover{ text-decoration:underline; }
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, [tabindex]:focus-visible{
  outline:3px solid var(--violet); outline-offset:2px; border-radius:4px;
}
h1,h2,h3,h4{ font-family:var(--font-display); color:var(--ink-900); line-height:1.15; margin:0 0 .5em; scroll-margin-top:88px; }
h1{ font-size:clamp(2rem,4.5vw,3.1rem); font-weight:700; }
h2{ font-size:clamp(1.5rem,3vw,2.1rem); font-weight:700; margin-top:2.2em; }
h3{ font-size:1.25rem; font-weight:700; margin-top:1.6em; }
p{ margin:0 0 1.1em; color:var(--ink-700); }
.wrap{ max-width:1140px; margin:0 auto; padding:0 24px; }
.sr-only{ position:absolute; width:1px;height:1px; overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; }
.skip-link{ position:absolute; left:-999px; top:0; background:var(--violet); color:#fff; padding:10px 16px; z-index:999; border-radius:0 0 8px 0; }
.skip-link:focus{ left:0; }

/* ---------- Header ---------- */
.site-header{ border-bottom:1px solid var(--border); background:rgba(255,253,249,0.92); backdrop-filter:saturate(180%) blur(8px); position:sticky; top:0; z-index:50; }
.header-inner{ display:flex; align-items:center; justify-content:space-between; padding:16px 24px; }
.brand{ display:flex; align-items:center; gap:10px; font-weight:800; font-size:1.15rem; color:var(--ink-900); }
.brand:hover{ text-decoration:none; }
.brand-mark{ display:inline-flex; align-items:center; justify-content:center; width:36px; height:36px; border-radius:50%; background:linear-gradient(135deg,var(--coral),var(--gold)); color:#fff; font-family:var(--font-display); font-weight:700; font-size:1.1rem; flex-shrink:0; }
.nav-menu{ display:flex; gap:22px; list-style:none; margin:0; padding:0; }
.nav-menu a{ color:var(--ink-700); font-weight:600; font-size:.95rem; padding:6px 2px; position:relative; }
.nav-menu a::after{ content:''; position:absolute; left:0; right:100%; bottom:-2px; height:2px; background:var(--violet); transition:right .18s ease; }
.nav-menu a:hover{ color:var(--violet-dark); text-decoration:none; }
.nav-menu a:hover::after{ right:0; }
.nav-toggle{ display:none; flex-direction:column; gap:5px; background:none; border:0; cursor:pointer; padding:10px; min-width:44px; min-height:44px; align-items:center; justify-content:center; }
.nav-toggle span{ width:22px; height:2px; background:var(--ink-900); display:block; transition:transform .2s ease, opacity .2s ease; }
.nav-toggle[aria-expanded="true"] span:nth-child(1){ transform:translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2){ opacity:0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3){ transform:translateY(-7px) rotate(-45deg); }

/* ---------- Breadcrumbs ---------- */
.breadcrumbs{ padding:12px 24px; font-size:.85rem; color:var(--ink-500); }
.breadcrumbs ol{ list-style:none; display:flex; flex-wrap:wrap; gap:6px; margin:0; padding:0; }
.breadcrumbs li:not(:last-child)::after{ content:'/'; margin-left:6px; color:var(--ink-300); }
.breadcrumbs a{ color:var(--ink-500); }

/* ---------- Hero ---------- */
.hero{ background:radial-gradient(circle at 15% 20%, #fff2e6 0%, transparent 45%), radial-gradient(circle at 85% 0%, #eef3ff 0%, transparent 40%), var(--paper-2); padding:56px 0 64px; }
.hero-grid{ display:grid; grid-template-columns:1.1fr 1fr; gap:48px; align-items:start; }
.eyebrow{ display:inline-block; background:#fff; border:1px solid var(--border); color:var(--violet-dark); font-weight:700; font-size:.78rem; letter-spacing:.06em; text-transform:uppercase; padding:6px 14px; border-radius:99px; margin-bottom:18px; }
.hero h1{ margin-bottom:.4em; }
.hero-sub{ font-size:1.1rem; max-width:46ch; }
.hero-points{ list-style:none; padding:0; margin:22px 0 0; display:grid; gap:10px; }
.hero-points li{ display:flex; gap:10px; align-items:flex-start; color:var(--ink-700); font-weight:500; }
.hero-points li::before{ content:'✓'; color:var(--teal); font-weight:800; }

/* ---------- Calculator Card ---------- */
.calc-card{ background:#fff; border:1px solid var(--border); border-radius:var(--radius-lg); box-shadow:var(--shadow-pop); padding:28px; }
.calc-card h2{ margin-top:0; font-size:1.4rem; }
.calc-card .sub{ color:var(--ink-500); font-size:.92rem; margin-bottom:20px; }
.field{ margin-bottom:16px; }
.field label{ display:block; font-weight:700; font-size:.88rem; margin-bottom:6px; color:var(--ink-900); }
.field input[type="date"], .field input[type="text"], .field input[type="email"], .field textarea{
  width:100%; padding:12px 14px; border:1.5px solid var(--border); border-radius:var(--radius-sm);
  font-size:1rem; font-family:var(--font-body); background:var(--paper); color:var(--ink-900);
}
.field input:focus, .field textarea:focus{ outline:3px solid #d9caff; border-color:var(--violet); }
.field-hint{ font-size:.8rem; color:var(--ink-500); margin-top:5px; }
.field-error{ font-size:.82rem; color:var(--coral-dark); margin-top:5px; display:none; font-weight:600; }
.btn-row{ display:flex; gap:12px; margin-top:20px; flex-wrap:wrap; }
.btn{ display:inline-flex; align-items:center; justify-content:center; gap:8px; border:0; cursor:pointer; padding:13px 26px; border-radius:99px; font-weight:700; font-size:.98rem; font-family:var(--font-body); transition:transform .12s ease, box-shadow .12s ease, background .15s ease; min-height:44px; }
.btn:active{ transform:translateY(1px); }
.btn-primary{ background:linear-gradient(135deg,var(--violet),var(--violet-dark)); color:#fff; box-shadow:0 10px 24px rgba(111,79,224,.32); }
.btn-primary:hover{ text-decoration:none; box-shadow:0 14px 30px rgba(111,79,224,.4); transform:translateY(-1px); }
.btn-ghost{ background:var(--ink-100); color:var(--ink-900); }
.btn-ghost:hover{ text-decoration:none; background:var(--violet); color:#fff; }
.btn-small{ padding:9px 18px; font-size:.85rem; min-height:38px; }

/* ---------- Results ---------- */
.results{ margin-top:26px; padding-top:22px; border-top:2px dashed var(--border); display:none; }
.results.is-visible{ display:block; animation:fadeUp .35s ease; }
@keyframes fadeUp{ from{ opacity:0; transform:translateY(8px);} to{ opacity:1; transform:translateY(0);} }
.result-hero{ background:linear-gradient(135deg,#fff3ea,#eef3ff); border:1px solid var(--border); border-radius:var(--radius-md); padding:20px; text-align:center; margin-bottom:18px; }
.result-hero .label{ font-size:.82rem; text-transform:uppercase; letter-spacing:.08em; color:var(--ink-500); font-weight:700; }
.result-hero .value{ font-family:var(--font-display); font-size:clamp(1.5rem,4vw,2.2rem); font-weight:700; color:var(--coral-dark); margin-top:4px; }
.result-hero .sub-value{ color:var(--ink-500); font-size:.95rem; margin-top:4px; }
.result-grid{ display:grid; grid-template-columns:repeat(auto-fit,minmax(150px,1fr)); gap:12px; }
.result-tile{ background:var(--paper-2); border:1px solid var(--border); border-radius:var(--radius-sm); padding:14px; transition:transform .12s ease; }
.result-tile:hover{ transform:translateY(-2px); }
.result-tile .t-label{ font-size:.76rem; text-transform:uppercase; letter-spacing:.05em; color:var(--ink-500); font-weight:700; margin-bottom:4px; }
.result-tile .t-value{ font-weight:700; font-size:1.05rem; color:var(--ink-900); }
.result-actions{ display:flex; gap:10px; margin-top:18px; flex-wrap:wrap; }

/* ---------- Sections / content ---------- */
.section{ padding:56px 0; }
.section-alt{ background:var(--paper-2); }
.content-prose{ max-width:78ch; }
.content-prose ul, .content-prose ol{ color:var(--ink-700); padding-left:1.3em; }
.content-prose li{ margin-bottom:.4em; }
.tool-grid{ display:grid; grid-template-columns:repeat(auto-fit,minmax(230px,1fr)); gap:18px; margin-top:24px; }
.tool-card{ background:#fff; border:1px solid var(--border); border-radius:var(--radius-md); padding:22px; box-shadow:var(--shadow-soft); transition:transform .15s ease, box-shadow .15s ease; }
.tool-card:hover{ transform:translateY(-4px); box-shadow:var(--shadow-pop); }
.tool-card .icon{ width:44px; height:44px; border-radius:12px; display:flex; align-items:center; justify-content:center; font-size:1.3rem; margin-bottom:12px; color:#fff; }
.tool-card h3{ margin-top:0; font-size:1.1rem; }
.tool-card p{ font-size:.92rem; margin-bottom:.6em; }
.tool-card a{ font-weight:700; font-size:.9rem; }
.icon-coral{ background:linear-gradient(135deg,var(--coral),var(--gold)); }
.icon-teal{ background:linear-gradient(135deg,var(--teal),#3fd6bd); }
.icon-violet{ background:linear-gradient(135deg,var(--violet),var(--violet-dark)); }

.faq-item{ border-bottom:1px solid var(--border); padding:18px 0; }
.faq-item h3{ margin:0 0 8px; font-size:1.05rem; }

.blog-grid{ display:grid; grid-template-columns:repeat(auto-fit,minmax(270px,1fr)); gap:22px; margin-top:24px; }
.blog-card{ background:#fff; border:1px solid var(--border); border-radius:var(--radius-md); padding:22px; box-shadow:var(--shadow-soft); display:flex; flex-direction:column; transition:transform .15s ease, box-shadow .15s ease; }
.blog-card:hover{ transform:translateY(-3px); box-shadow:var(--shadow-pop); }
.blog-card h3{ margin-top:0; font-size:1.1rem; }
.blog-card h3 a{ color:var(--ink-900); }
.blog-card h3 a:hover{ color:var(--violet-dark); }
.blog-card p{ font-size:.92rem; flex-grow:1; }
.tag{ display:inline-block; font-size:.72rem; font-weight:700; text-transform:uppercase; letter-spacing:.05em; color:var(--teal-dark); background:#e6fbf6; padding:4px 10px; border-radius:99px; margin-bottom:10px; width:fit-content; }

.related-grid{ display:grid; grid-template-columns:repeat(auto-fit,minmax(220px,1fr)); gap:18px; margin:20px 0 8px; }
.related-card{ background:#fff; border:1px solid var(--border); border-radius:var(--radius-md); overflow:hidden; box-shadow:var(--shadow-soft); transition:transform .15s ease, box-shadow .15s ease; display:block; }
.related-card:hover{ transform:translateY(-3px); box-shadow:var(--shadow-pop); text-decoration:none; }
.related-card img{ width:100%; height:110px; object-fit:cover; }
.related-card .related-card-body{ padding:14px 16px; }
.related-card .related-card-body span{ font-size:.72rem; font-weight:700; text-transform:uppercase; letter-spacing:.05em; color:var(--teal-dark); }
.related-card .related-card-body h4{ font-family:var(--font-body); font-size:.95rem; font-weight:700; color:var(--ink-900); margin:4px 0 0; line-height:1.35; }

.cta-band{ background:linear-gradient(135deg,var(--violet),var(--violet-dark)); color:#fff; border-radius:var(--radius-lg); padding:40px; text-align:center; margin:56px 0; }
.cta-band h2{ color:#fff; margin-top:0; }
.cta-band p{ color:#e7defe; }
.cta-band .btn-primary{ background:#fff; color:var(--violet-dark); box-shadow:none; }

table.data-table{ width:100%; border-collapse:collapse; margin:0; font-size:.94rem; min-width:420px; }
table.data-table th, table.data-table td{ border:1px solid var(--border); padding:10px 12px; text-align:left; }
table.data-table th{ background:var(--paper-2); }
.table-scroll{ overflow-x:auto; margin:1.4em 0; border-radius:var(--radius-sm); -webkit-overflow-scrolling:touch; }
.table-scroll table.data-table{ margin:0; }

/* ---------- Quick answer callout ---------- */
.quick-answer{ display:flex; gap:14px; align-items:flex-start; background:linear-gradient(135deg,#fff3ea,#eef3ff); border:1px solid var(--border); border-radius:var(--radius-md); padding:18px 20px; margin:20px 0 28px; }
.quick-answer .qa-icon{ flex-shrink:0; width:34px; height:34px; border-radius:50%; background:var(--violet); color:#fff; display:flex; align-items:center; justify-content:center; font-weight:800; font-family:var(--font-display); font-size:1rem; }
.quick-answer .qa-label{ font-size:.74rem; text-transform:uppercase; letter-spacing:.07em; font-weight:800; color:var(--violet-dark); margin-bottom:4px; }
.quick-answer p{ margin:0; color:var(--ink-900); font-weight:500; }
.quick-answer p + p{ margin-top:6px; font-weight:400; color:var(--ink-700); }

/* ---------- Share bar ---------- */
.share-bar{ display:flex; flex-wrap:wrap; align-items:center; gap:12px; background:var(--paper-2); border:1px solid var(--border); border-radius:var(--radius-md); padding:16px 18px; margin:28px 0; }
.share-label{ font-weight:700; font-size:.92rem; color:var(--ink-900); margin-right:4px; }
.share-buttons{ display:flex; flex-wrap:wrap; gap:8px; flex:1; }
.share-btn{ display:inline-flex; align-items:center; gap:6px; padding:9px 14px; border-radius:99px; background:#fff; border:1px solid var(--border); color:var(--ink-700); font-size:.82rem; font-weight:600; cursor:pointer; font-family:var(--font-body); min-height:40px; transition:border-color .15s ease, color .15s ease, transform .1s ease; }
.share-btn:hover{ text-decoration:none; transform:translateY(-1px); }
.share-btn:active{ transform:translateY(0); }
.share-btn svg{ flex-shrink:0; }
.share-btn span{ white-space:nowrap; }
.share-fb:hover{ border-color:#1877F2; color:#1877F2; }
.share-x:hover{ border-color:#161513; color:#161513; }
.share-wa:hover{ border-color:#25D366; color:#128C4A; }
.share-li:hover{ border-color:#0A66C2; color:#0A66C2; }
.share-reddit:hover{ border-color:#FF4500; color:#FF4500; }
.share-telegram:hover{ border-color:#26A5E4; color:#26A5E4; }
.share-pin:hover{ border-color:#E60023; color:#E60023; }
.share-email:hover{ border-color:var(--ink-500); color:var(--ink-900); }
.share-copy:hover, .share-native:hover{ border-color:var(--violet); color:var(--violet-dark); }
@media (max-width:480px){ .share-btn span{ display:none; } .share-btn{ padding:10px; width:40px; justify-content:center; } .share-label{ width:100%; } }

/* ---------- Article / content images ---------- */
.article-featured-img{ width:100%; height:auto; border-radius:var(--radius-md); margin:20px 0 8px; box-shadow:var(--shadow-soft); }
.article-context-img{ width:100%; max-width:560px; height:auto; border-radius:var(--radius-md); margin:24px auto; display:block; box-shadow:var(--shadow-soft); }
figure.content-figure{ margin:24px 0; }
figure.content-figure figcaption{ text-align:center; font-size:.85rem; color:var(--ink-500); margin-top:8px; }
.tool-illustration{ width:100%; max-width:480px; height:auto; border-radius:var(--radius-md); margin:0 auto 8px; display:block; }
.blog-card-thumb{ width:100%; height:150px; object-fit:cover; border-radius:var(--radius-sm); margin-bottom:14px; }
.homepage-illustration{ width:100%; max-width:420px; height:auto; border-radius:var(--radius-md); margin:0 auto; display:block; }

/* ---------- Footer ---------- */
.site-footer{ background:var(--ink-900); color:#cfc9e4; margin-top:60px; padding:48px 0 0; }
.footer-inner{ display:grid; grid-template-columns:1.4fr 1fr 1fr 1fr; gap:32px; padding-bottom:32px; }
.footer-brand p{ color:#a8a2bd; font-size:.9rem; }
.footer-col h3{ color:#fff; font-size:.95rem; margin-top:0; }
.footer-col ul{ list-style:none; padding:0; margin:0; display:grid; gap:8px; }
.footer-col a{ color:#cfc9e4; font-size:.9rem; }
.footer-col a:hover{ color:#fff; }
.footer-bottom{ border-top:1px solid rgba(255,255,255,.1); padding:18px 24px; font-size:.82rem; color:#8b84a8; }

/* ---------- Print ---------- */
@media print{
  .site-header,.site-footer,.breadcrumbs,.btn-row,.result-actions,.nav-toggle,.cta-band{ display:none !important; }
  body{ background:#fff; }
  .results{ display:block !important; }
}

/* ---------- Responsive ---------- */
@media (max-width:900px){
  .hero-grid{ grid-template-columns:1fr; }
  .footer-inner{ grid-template-columns:1fr 1fr; }
}
@media (max-width:640px){
  .nav-toggle{ display:flex; }
  .nav-menu{ display:none; position:absolute; top:100%; left:0; right:0; background:#fff; border-bottom:1px solid var(--border); box-shadow:var(--shadow-pop); flex-direction:column; padding:14px 24px; gap:14px; }
  .nav-menu.is-open{ display:flex; }
  .nav-menu a::after{ display:none; }
  .footer-inner{ grid-template-columns:1fr; }
  .calc-card{ padding:20px; }
  .cta-band{ padding:28px 20px; }
  .result-grid{ grid-template-columns:repeat(auto-fit,minmax(130px,1fr)); }
  .quick-answer{ flex-direction:column; }
}